Twister stop-motion.



T. E. SMITH.

TWISTEE STOP MOTION.

APPLICATION FILED D30. 81, 1908.

967,987. Patentd Aug.23, 1910.

wa f5 Z2 THOMAS HENRY SMITH, OF JAME STOWN, NEW YORK.

TWISTER STOP-MOTION.

Specification of Letters Patent.

Patented Aug. 23, 1910.

Application filed December 31, 1906. Serial No. 350,296.

To all whom it may concern: 7

Be it known that 1,. THOMAS HENRY SMITH, a citizen of the United States, and a resident of Jamestown, in the county of Chautauqua and State of New York, have invented a new and useful Improvement in Twister Stop-Motions, of which the followmg, taken in connection with the accompanying drawing, is a full, clear, and exact description.

The invention relates to stop motions for twisting multiple threads; and the object of my invention is to provide a novel and positive stopping mechanism, which stops the delivery of the yarn by holding all the threads when any one of them breaks. This stopping mechanism is adaptable to twisting three or more ply threads, supplementing and perfecting the stopping mechanism shown in my former patents Number 549,859 of November 12th, 1905 and numbers 773,037 and 773,038 of October 25th, 1904., which former mechanism is only fully effective when used for the twisting of two ply threads.

In the drawings, Figure 1 is a side elevation of the roll stand, showing the improved stop motion in normal position with unbroken threads and also showing in dotted lines the stopping action of the pivotally mounted thread guide-stops on the top roll when the thread breaks. Fig. 2 is a plan View of the rolls and stop mechanism. Fig.

3 is a detail side elevation of one of the guide-stop wires for the threads. Fig. 4 is a perspective View of the holding piece for the thread guide-stops showing the slots for said guide and the diagonal groove across the end for the holding pin.

Similar numerals refer to corresponding parts in the several views.

The numeral 10 indicates the end brackets to the roll stand, which supports a lower roll 11 revolubly mounted therein and has suitable means for turning the same. Bracket 10 also supports a cap bar 12 which has brackets 13 at regular intervals which extend up between and hold the short frictional upper rolls 14 in position directly above lower roll 11 and in such a manner that upper rolls 14 are independent of each other and free to be revolved by frictional contact with lower roll 11. Brackets 13 are not shown in Fig. 1 in order to more clearly show the action of the stopping mechanism.

The stopping mechanism consists of a slotted metal holding piece 15 for each pair of rolls 11 and 14, which piece 15 is attached to cap bar 12 by means of lugs 16 and 17 which extend down on opposite sides of bar 12 and a set screw 18 preferably in lug 16. Piece 15 has a number of deep crosswise slots 19 on its upper side to receive the thread guide-stops 20 therein.

Thread guide-stops 20 may be stamped out of sheet steel but are preferably made of wire with a loop 21 which extends down into slot 19. A lengthwise hole extends through piece 15 to receive the staple pin 22, which is formed with a return bend 23 along the outer side of the piece 15 for a purpose hereinafter described. Thread guide stops 20 have pig'tail rear ends 24 to receive the thread as it comes from the spool to the bobbin. The front end 25 of guides 20 curves downwardly in the rear of roll 14, as shown. It is apparentthat there may be as many slots 19 in piece 15 as there are threads to be twisted. Roll 14 has a lengthwise groove 26 to receive the ends 25 of thread guide-stops 20 when the thread breaks, as shown in dotted line in Fig. 1. Groove 26 is cut diagonally across the periphery of the roll 14 in order not to cut the threads 27 as they pass between the rolls.

A groove 27 is cut diagonally across the end of piece 15 and pin 22 is slidably mounted in piece 15 so that when the outer arm 23 of the pin is raised to the posit-ion shown in dotted lines in Figs. 2 and 3, it is held firmly in position and likewise holds the thread guide-stops in firm position because of the angle of the groove 27, into which the pin fits. This position of the staple pin 23 makes the stopping part of the thread guide inoperative, converting the guide-stop into a guide only, the action of the stop not being needed only when two ply threads are twisted. A pig-tail thread guide 28 is provided on the upper side of piece 15 to gather the different threads into one as they pass from the pig-tails 24, and to prevent them slipping off the ends, of the top roll and making hard twisted yarn.

To operate the stopping mechanism, the threads 27 are threaded through pig-tails 24, one end to each thread guide-stop, the number of thread guide-stops corresponding to the number of ends to be twisted. These ends are all gathered together and pass through pig-tail 28 and over the upper roll 14 and back over lower roll 11 and thence to the bobbin below. It is apparent that the; threads will run smoothly without any obstruction until one of the threads breakat the back, in which event the rear end ofguide 20 drops, as partly shown in dotted lines in Fig. 1, and front end 25 presses against roll 14 until diagonal slot 26 is encountered when end 25 enters slot 26 positively stopping and holding roll 14 and all the threads which are being twisted by roll 14. The continued motion of the spindle below will quickly twist off these threads and the end may then hang loose without waste until connected up by the operator.

Pig-tails 24% form separate guides for each of the ends as the thread descends from the bobbin and no other guides are needed on the frame in the rear of the rolls. When the multiple stopping mechanism is not needed the staple 22 can he slipped endwise into groove 27 and arm 23 will support the guides 24L in fixed position, making fixed individual thread guides for each of the ends.

I claim as new I 1. In a twister stop motion, a frame, abottom roll on said frame and suitable means for driving the same, a top roll on said frame frictionally driven by said bottom roll and having a groove extending diagonally across its yarn bearing surface to prevent jumping under rapid revolution, and a thread guide pivotally mounted adjacent to said roll having means for engaging said diagonal groove to stop said roll when the thread breaks.

'2. A twister stop motion consisting ofa top roll and an under roll to receive the yarn therebetween and means for driving said rolls, a cap bar, a piece on said cap bar havmg crosswise slots, said top roll having a groove diagonal of its outer surface to prevent jumping, thread guides pivotally mounted in said slots, and projecting ends on said guides to bear against said top roll when the thread breaks and engage said diagonal groove.

.3. In a twister stop motion, a frame, a bottom roll on said frame and suitable means for driving the same, a top roll on said frame frictionally driven by said bottom roll and having a peripheral groove, a cap bar on said frame in the rear of said rolls, a slotted piece on said cap bar, thread guides pivotally mounted in said slotted piece by means of a slidable pin, said pin having a return bend beneath said thread guide to uphold the same, and a notch support on said slotted piece for said pin in the raised position.

4. In a stop motion, a frame, a bottom roll 11 revolubly mounted on said frame and means for driving the same, a top roll 14; revolubly mounted on said frame having a diagonal groove 26 on its outer surface, a

' cap bar 12 on said frame in the rear of said rolls, a piece 15 on said cap bar having slots 19, pins 22 in said piece 15, thread guides 20 pivotally mounted in slots 19 by said pin 22, said thread guides having. rear arms with pig-tails 24 for the thread ends and a downwardly extending arm 25 to engage slot 26 and stop roll 14 when the thread breaks, a groove 27 in piece 15 to receive pin 22, and an arm 23011 said pin to uphold said thread guides, substantially as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the-presence of two subscribing witnesses.

THOMAS HENRY SMITH.

Witnesses:

A. W. KETTLE, I. A. Erswonrn. 

